StackOverflow2013

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2012-07-15T20:43:22.783
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Some notes based on my experience: Source data format: you'll probably want to be able to import data from ESRI shapefiles and OpenStreetMap (which comes as XML or a more compact but equivalent binary format). NAVTEQ data can be obtained as ESRI shapefiles. Shaded relief can be obtained by processing USGS height data (http://dds.cr.usgs.gov/srtm/). 2D versus 3D: the step from one to the other is a big one. 2D data is almost invariably provided as latitude and longitude and projected to a plane: Google Maps and OpenStreetMap use a very simple but much derided spherical Mercator projection. Moving to 3D requires a decision on the coordinate system - projected plane plus height versus true 3D based on the shape of the earth - and possibly problems involving level of detail. A good way to proceed might be to draw the shape of the earth (hills and valleys) as a triangle mesh, then drape the rest of the map on it as a texture. You might want to consider "two and a half D" - using a perspective transformation to display the map as if viewing it from a height. Libraries: there's quite a big list of map rendering libraries <a href="http://wiki.openstreetmap.org/wiki/Rendering" rel="nofollow">here</a>, both commercial and non-commercial (disclosure: mine is one of them). Many of these libraries have style sheet systems for customising the map look and feel. A very good open-source rendering library (not mine) is Mapnik, but I am not sure whether that will port very easily on to iOS. However, it's a very good idea to read up on how Mapnik and other rendering libraries do their work, to get a feel for the problem. The OpenStreetMap wiki is a good portal for learning more about the field. Text rendering on maps is nearly always done using <a href="http://www.freetype.org" rel="nofollow">FreeType</a>, an open-source rasterizer library with an unrestrictive license.
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1. POAdding vector map data to iOS GPS app. Real Time vector graphics rendering
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1. PTAnswer
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1. USGraham Asher
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1. USGraham Asher
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